The Ka band (Pronounced: "Kay-A Band")
covers the frequencies of 26.5-40GHz[1]. The
Ka band is part of the K band of the microwave band of the electromagnetic spectrum. This
symbol refers to "K-above" — in other words, the band directly
above the K-band. The so-called 30/20 GHz band is used in communications satellites, uplink in
either the 27.5 GHz and 31 GHz bands[2], and
high-resolution, close-range targeting radars aboard military airplanes. Some
frequencies in this radio band are used for vehicle speed detection
by law enforcement[3]. Kepler Mission
uses this frequency range to downlink the scientific data collected
by the space telescope.

The designation "Ka-band" is from Kurz-above, which
stems from the German word "kurz" meaning short.[4]

Other
Microwave bands

The microwave spectrum is usually defined as electromagnetic
energy ranging from approximately 1 GHz to 100 GHz in
frequency, but older usage includes lower frequencies. Most common
applications are within the 1 to 40 GHz range. Microwave
frequency bands, as defined by the Radio Society of Great
Britain (RSGB), are shown in the table below:

Footnote: P band is sometimes incorrectly used for Ku Band. "P"
for "previous" was a radar band used in the UK ranging from 250 to
500 MHz and now obsolete per IEEE Std 521, see[1] and [2]. For other
definitions see Letter Designations of
Microwave Bands